diff --git a/scripts/upgrade b/scripts/upgrade
index ee5229d..5acdb8b 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -48,6 +48,7 @@ then
 
 	# Download, check integrity, uncompress and patch the source from app.src
 	ynh_setup_source --dest_dir="$install_dir"
+	chown -R $app:www-data "$install_dir"
 
 	ynh_script_progression --message="Installing NodeJS..." --weight=20